49155661 has 2 divisors, whose sum is σ = 49155662. Its totient is φ = 49155660.

The previous prime is 49155629. The next prime is 49155697. The reversal of 49155661 is 16655194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46498761 + 2656900 = 6819^2 + 1630^2 .

It is a cyclic number.

It is not a de Polignac number, because 49155661 - 2⁵ = 49155629 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 49155661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49155461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24577830 + 24577831.

It is an arithmetic number, because the mean of its divisors is an integer number (24577831).

Almost surely, 2^49155661 is an apocalyptic number.

It is an amenable number.

49155661 is a deficient number, since it is larger than the sum of its proper divisors (1).

49155661 is an equidigital number, since it uses as much as digits as its factorization.

49155661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 37.

The square root of 49155661 is about 7011.1098265539. The cubic root of 49155661 is about 366.3176520068.

The spelling of 49155661 in words is "forty-nine million, one hundred fifty-five thousand, six hundred sixty-one".