49691557 has 2 divisors, whose sum is σ = 49691558. Its totient is φ = 49691556.

The previous prime is 49691507. The next prime is 49691573. The reversal of 49691557 is 75519694.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25867396 + 23824161 = 5086^2 + 4881^2 .

It is a cyclic number.

It is not a de Polignac number, because 49691557 - 2⁷ = 49691429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49691507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24845778 + 24845779.

It is an arithmetic number, because the mean of its divisors is an integer number (24845779).

Almost surely, 2^49691557 is an apocalyptic number.

It is an amenable number.

49691557 is a deficient number, since it is larger than the sum of its proper divisors (1).

49691557 is an equidigital number, since it uses as much as digits as its factorization.

49691557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 340200, while the sum is 46.

The square root of 49691557 is about 7049.2238579861. The cubic root of 49691557 is about 367.6440442939.

The spelling of 49691557 in words is "forty-nine million, six hundred ninety-one thousand, five hundred fifty-seven".