737634721 has 2 divisors, whose sum is σ = 737634722. Its totient is φ = 737634720.

The previous prime is 737634707. The next prime is 737634727. The reversal of 737634721 is 127436737.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 671846400 + 65788321 = 25920^2 + 8111^2 .

It is an emirp because it is prime and its reverse (127436737) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 737634721 - 2²⁷ = 603416993 is a prime.

It is not a weakly prime, because it can be changed into another prime (737634727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 368817360 + 368817361.

It is an arithmetic number, because the mean of its divisors is an integer number (368817361).

Almost surely, 2^737634721 is an apocalyptic number.

It is an amenable number.

737634721 is a deficient number, since it is larger than the sum of its proper divisors (1).

737634721 is an equidigital number, since it uses as much as digits as its factorization.

737634721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 148176, while the sum is 40.

The square root of 737634721 is about 27159.4315293969. The cubic root of 737634721 is about 903.5394452440.

The spelling of 737634721 in words is "seven hundred thirty-seven million, six hundred thirty-four thousand, seven hundred twenty-one".