149078107921 has 2 divisors, whose sum is σ = 149078107922. Its totient is φ = 149078107920.

The previous prime is 149078107909. The next prime is 149078108017. The reversal of 149078107921 is 129701870941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136132219521 + 12945888400 = 368961^2 + 113780^2 .

It is a cyclic number.

It is not a de Polignac number, because 149078107921 - 2⁵ = 149078107889 is a prime.

It is a super-2 number, since 2×149078107921² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (149078107901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74539053960 + 74539053961.

It is an arithmetic number, because the mean of its divisors is an integer number (74539053961).

Almost surely, 2^149078107921 is an apocalyptic number.

It is an amenable number.

149078107921 is a deficient number, since it is larger than the sum of its proper divisors (1).

149078107921 is an equidigital number, since it uses as much as digits as its factorization.

149078107921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 49.

The spelling of 149078107921 in words is "one hundred forty-nine billion, seventy-eight million, one hundred seven thousand, nine hundred twenty-one".