15490961 has 4 divisors (see below), whose sum is σ = 16402212. Its totient is φ = 14579712.

The previous prime is 15490957. The next prime is 15490973. The reversal of 15490961 is 16909451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16909451 = 13 ⋅1300727.

It can be written as a sum of positive squares in 2 ways, for example, as 9265936 + 6225025 = 3044^2 + 2495^2 .

It is a cyclic number.

It is not a de Polignac number, because 15490961 - 2² = 15490957 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15490921) 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, 455600 + ... + 455633.

It is an arithmetic number, because the mean of its divisors is an integer number (4100553).

Almost surely, 2^15490961 is an apocalyptic number.

It is an amenable number.

15490961 is a deficient number, since it is larger than the sum of its proper divisors (911251).

15490961 is an equidigital number, since it uses as much as digits as its factorization.

15490961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911250.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 15490961 is about 3935.8558154485. The cubic root of 15490961 is about 249.2830713519.

It can be divided in two parts, 154909 and 61, that multiplied together give a palindrome (9449449).

The spelling of 15490961 in words is "fifteen million, four hundred ninety thousand, nine hundred sixty-one".