42949961 has 2 divisors, whose sum is σ = 42949962. Its totient is φ = 42949960.

The previous prime is 42949943. The next prime is 42949967. The reversal of 42949961 is 16994924.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42823936 + 126025 = 6544^2 + 355^2 .

It is a cyclic number.

It is not a de Polignac number, because 42949961 - 2¹⁸ = 42687817 is a prime.

It is not a weakly prime, because it can be changed into another prime (42949967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21474980 + 21474981.

It is an arithmetic number, because the mean of its divisors is an integer number (21474981).

Almost surely, 2^42949961 is an apocalyptic number.

It is an amenable number.

42949961 is a deficient number, since it is larger than the sum of its proper divisors (1).

42949961 is an equidigital number, since it uses as much as digits as its factorization.

42949961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 44.

The square root of 42949961 is about 6553.6219756712. The cubic root of 42949961 is about 350.2038567512.

The spelling of 42949961 in words is "forty-two million, nine hundred forty-nine thousand, nine hundred sixty-one".