61691207 has 8 divisors (see below), whose sum is σ = 63951600. Its totient is φ = 59439744.

The previous prime is 61691159. The next prime is 61691219. The reversal of 61691207 is 70219616.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61691207 - 2¹² = 61687111 is a prime.

It is a super-2 number, since 2×61691207² = 7611610042233698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61691297) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13919 + ... + 17807.

It is an arithmetic number, because the mean of its divisors is an integer number (7993950).

Almost surely, 2^61691207 is an apocalyptic number.

61691207 is a deficient number, since it is larger than the sum of its proper divisors (2260393).

61691207 is a wasteful number, since it uses less digits than its factorization.

61691207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4465.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 61691207 is about 7854.3750228774. The cubic root of 61691207 is about 395.1309868420.

The spelling of 61691207 in words is "sixty-one million, six hundred ninety-one thousand, two hundred seven".