1954729521 has 24 divisors (see below), whose sum is σ = 2918462976. Its totient is φ = 1259435520.

The previous prime is 1954729493. The next prime is 1954729529. The reversal of 1954729521 is 1259274591.

1954729521 is a `hidden beast` number, since 1 + 9 + 54 + 72 + 9 + 521 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-1954729521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1954729529) 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, 225361 + ... + 233873.

It is an arithmetic number, because the mean of its divisors is an integer number (121602624).

Almost surely, 2^1954729521 is an apocalyptic number.

It is an amenable number.

1954729521 is a deficient number, since it is larger than the sum of its proper divisors (963733455).

1954729521 is a wasteful number, since it uses less digits than its factorization.

1954729521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9373 (or 9370 counting only the distinct ones).

The product of its digits is 226800, while the sum is 45.

The square root of 1954729521 is about 44212.3231803080. The cubic root of 1954729521 is about 1250.3422041219.

The spelling of 1954729521 in words is "one billion, nine hundred fifty-four million, seven hundred twenty-nine thousand, five hundred twenty-one".