90561497949 has 24 divisors (see below), whose sum is σ = 141092646240. Its totient is φ = 55643434272.

The previous prime is 90561497911. The next prime is 90561497993. The reversal of 90561497949 is 94979416509.

90561497949 is a `hidden beast` number, since 9 + 0 + 5 + 614 + 9 + 7 + 9 + 4 + 9 = 666.

It is not a de Polignac number, because 90561497949 - 2¹³ = 90561489757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90561497909) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 526659 + ... + 677120.

It is an arithmetic number, because the mean of its divisors is an integer number (5878860260).

Almost surely, 2^90561497949 is an apocalyptic number.

It is an amenable number.

90561497949 is a deficient number, since it is larger than the sum of its proper divisors (50531148291).

90561497949 is a wasteful number, since it uses less digits than its factorization.

90561497949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1204441 (or 1204438 counting only the distinct ones).

The product of its (nonzero) digits is 22044960, while the sum is 63.

The spelling of 90561497949 in words is "ninety billion, five hundred sixty-one million, four hundred ninety-seven thousand, nine hundred forty-nine".