125640454 has 4 divisors (see below), whose sum is σ = 188460684. Its totient is φ = 62820226.

The previous prime is 125640443. The next prime is 125640457. The reversal of 125640454 is 454046521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 454046521 = 1213 ⋅374317.

It is a super-2 number, since 2×125640454² = 31571047362652232, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125640457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31410112 + ... + 31410115.

It is an arithmetic number, because the mean of its divisors is an integer number (47115171).

Almost surely, 2^125640454 is an apocalyptic number.

125640454 is a deficient number, since it is larger than the sum of its proper divisors (62820230).

125640454 is an equidigital number, since it uses as much as digits as its factorization.

125640454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62820229.

The product of its (nonzero) digits is 19200, while the sum is 31.

The square root of 125640454 is about 11208.9452670624. The cubic root of 125640454 is about 500.8524843814.

Adding to 125640454 its reverse (454046521), we get a palindrome (579686975).

The spelling of 125640454 in words is "one hundred twenty-five million, six hundred forty thousand, four hundred fifty-four".