57072949 has 2 divisors, whose sum is σ = 57072950. Its totient is φ = 57072948.

The previous prime is 57072947. The next prime is 57072973. The reversal of 57072949 is 94927075.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56927025 + 145924 = 7545^2 + 382^2 .

It is a cyclic number.

It is not a de Polignac number, because 57072949 - 2¹ = 57072947 is a prime.

Together with 57072947, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57072947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28536474 + 28536475.

It is an arithmetic number, because the mean of its divisors is an integer number (28536475).

Almost surely, 2^57072949 is an apocalyptic number.

It is an amenable number.

57072949 is a deficient number, since it is larger than the sum of its proper divisors (1).

57072949 is an equidigital number, since it uses as much as digits as its factorization.

57072949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 158760, while the sum is 43.

The square root of 57072949 is about 7554.6640560650. The cubic root of 57072949 is about 385.0142210972.

The spelling of 57072949 in words is "fifty-seven million, seventy-two thousand, nine hundred forty-nine".