91551429 has 24 divisors (see below), whose sum is σ = 136168032. Its totient is φ = 59240160.

The previous prime is 91551419. The next prime is 91551433. The reversal of 91551429 is 92415519.

It is not a de Polignac number, because 91551429 - 2⁹ = 91550917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91551393 and 91551402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91551419) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69394 + ... + 70700.

It is an arithmetic number, because the mean of its divisors is an integer number (5673668).

Almost surely, 2^91551429 is an apocalyptic number.

It is an amenable number.

91551429 is a deficient number, since it is larger than the sum of its proper divisors (44616603).

91551429 is a wasteful number, since it uses less digits than its factorization.

91551429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1537 (or 1534 counting only the distinct ones).

The product of its digits is 16200, while the sum is 36.

The square root of 91551429 is about 9568.2510941133. The cubic root of 91551429 is about 450.7008486434.

The spelling of 91551429 in words is "ninety-one million, five hundred fifty-one thousand, four hundred twenty-nine".