1625400331 has 4 divisors (see below), whose sum is σ = 1626539200. Its totient is φ = 1624261464.

The previous prime is 1625400307. The next prime is 1625400437. The reversal of 1625400331 is 1330045261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1330045261 = 557 ⋅2387873.

It is a cyclic number.

It is not a de Polignac number, because 1625400331 - 2⁹ = 1625399819 is a prime.

It is a super-3 number, since 3×1625400331³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1625400296 and 1625400305.

It is not an unprimeable number, because it can be changed into a prime (1625400031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 567291 + ... + 570148.

It is an arithmetic number, because the mean of its divisors is an integer number (406634800).

Almost surely, 2^1625400331 is an apocalyptic number.

1625400331 is a deficient number, since it is larger than the sum of its proper divisors (1138869).

1625400331 is a wasteful number, since it uses less digits than its factorization.

1625400331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138868.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 1625400331 is about 40316.2539306419. The cubic root of 1625400331 is about 1175.7638807709.

Adding to 1625400331 its reverse (1330045261), we get a palindrome (2955445592).

It can be divided in two parts, 1625 and 400331, that added together give a square (401956 = 634²).

The spelling of 1625400331 in words is "one billion, six hundred twenty-five million, four hundred thousand, three hundred thirty-one".