9901642954 has 12 divisors (see below), whose sum is σ = 17277356754. Its totient is φ = 4243561224.

The previous prime is 9901642951. The next prime is 9901642973. The reversal of 9901642954 is 4592461099.

It can be written as a sum of positive squares in only one way, i.e., 9278890929 + 622752025 = 96327^2 + 24955^2 .

It is a super-2 number, since 2×9901642954² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a junction number, because it is equal to n+sod(n) for n = 9901642898 and 9901642907.

It is not an unprimeable number, because it can be changed into a prime (9901642951) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50518489 + ... + 50518684.

Almost surely, 2^9901642954 is an apocalyptic number.

9901642954 is a deficient number, since it is larger than the sum of its proper divisors (7375713800).

9901642954 is a wasteful number, since it uses less digits than its factorization.

9901642954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101037189 (or 101037182 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 49.

The square root of 9901642954 is about 99506.9995226466. Note that the first 3 decimals coincide. The cubic root of 9901642954 is about 2147.3479435515.

The spelling of 9901642954 in words is "nine billion, nine hundred one million, six hundred forty-two thousand, nine hundred fifty-four".