25615401 has 32 divisors (see below), whose sum is σ = 42071040. Its totient is φ = 13535424.

The previous prime is 25615351. The next prime is 25615409. The reversal of 25615401 is 10451652.

It is not a de Polignac number, because 25615401 - 2⁹ = 25614889 is a prime.

It is a super-2 number, since 2×25615401² = 1312297536781602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25615409) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16411 + ... + 17903.

It is an arithmetic number, because the mean of its divisors is an integer number (1314720).

Almost surely, 2^25615401 is an apocalyptic number.

25615401 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25615401 is a deficient number, since it is larger than the sum of its proper divisors (16455639).

25615401 is a wasteful number, since it uses less digits than its factorization.

25615401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 25615401 is about 5061.1659723823. The cubic root of 25615401 is about 294.7816098861.

The spelling of 25615401 in words is "twenty-five million, six hundred fifteen thousand, four hundred one".