1625717261 has 4 divisors (see below), whose sum is σ = 1857962592. Its totient is φ = 1393471932.

The previous prime is 1625717207. The next prime is 1625717287. The reversal of 1625717261 is 1627175261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1627175261 = 14947 ⋅108863.

It is a cyclic number.

It is not a de Polignac number, because 1625717261 - 2¹⁴ = 1625700877 is a prime.

It is a super-2 number, since 2×1625717261² = 5285913225426684242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1625717461) 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, 116122655 + ... + 116122668.

It is an arithmetic number, because the mean of its divisors is an integer number (464490648).

Almost surely, 2^1625717261 is an apocalyptic number.

It is an amenable number.

1625717261 is a deficient number, since it is larger than the sum of its proper divisors (232245331).

1625717261 is an equidigital number, since it uses as much as digits as its factorization.

1625717261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232245330.

The product of its digits is 35280, while the sum is 38.

The square root of 1625717261 is about 40320.1842877733. The cubic root of 1625717261 is about 1175.8402948954.

The spelling of 1625717261 in words is "one billion, six hundred twenty-five million, seven hundred seventeen thousand, two hundred sixty-one".