91142690402 has 4 divisors (see below), whose sum is σ = 136714035606. Its totient is φ = 45571345200.

The previous prime is 91142690383. The next prime is 91142690407. The reversal of 91142690402 is 20409624119.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 60279579361 + 30863111041 = 245519^2 + 175679^2 .

It is not an unprimeable number, because it can be changed into a prime (91142690407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22785672599 + ... + 22785672602.

Almost surely, 2^91142690402 is an apocalyptic number.

91142690402 is a deficient number, since it is larger than the sum of its proper divisors (45571345204).

91142690402 is a wasteful number, since it uses less digits than its factorization.

91142690402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45571345203.

The product of its (nonzero) digits is 31104, while the sum is 38.

The spelling of 91142690402 in words is "ninety-one billion, one hundred forty-two million, six hundred ninety thousand, four hundred two".